Wi-Fi for retail
In retail the Wi-Fi is a trading system. If the tills, the scanners or the payment terminals are affected, the store stops taking money — which makes retail one of the few environments where the business case for doing it properly writes itself.
The RF problem in a shop
Stock is attenuation, and it moves
Shop fit is RF obstruction. Gondola ends, tall shelving runs, chillers and freezer cabinets, metal fixtures, mirrors, rails of dense clothing, stacked promotional stock and seasonal displays all absorb or reflect. As with a warehouse, the environment changes: a store surveyed after a refit, before the stock lands, is not the store that trades in December. Chillers and freezers deserve particular mention — a run of refrigeration is a wall of metal and compressors, both an obstruction and an interference source.
The devices that matter are the weak ones
Handheld scanners, price-verification units, mobile payment terminals and stock-count devices have small antennas and low transmit power, and they are used exactly where the obstruction is worst — down the aisles, in the chiller run, at the back of the stockroom. A design that satisfies a laptop at the till point can be well short for the device a colleague is using in aisle nine.
EPOS and payment must not be affected by anything else
Tills, self-checkout, chip and PIN, mobile payment and back-office systems are the traffic the business cannot lose. In a store that runs customer Wi-Fi on the same network with no policy, a Saturday afternoon of customers streaming video is directly competing with the payment estate. Payment infrastructure also carries its own compliance requirements, which come from the retailer's own PCI position and acquirer, and the network is designed to meet whatever those require.
Stockrooms, back of house and the yard
The stockroom is usually the worst-covered part of a store and one of the most important — goods-in, stock counts, transfers and picking all happen there, on the same weak handheld devices, surrounded by dense stock and often behind a solid wall from the shop floor. Delivery bays, yards and staff areas are consistently out of scope on the original design and consistently a problem later.
Customer Wi-Fi is a different product
Customer access has commercial purposes — footfall analytics, app engagement, loyalty, click and collect, keeping people connected long enough to check a price rather than leave. Those are legitimate, and they are also a data-protection matter: whatever a portal collects, and whatever is done with device data, has to sit inside the retailer's own privacy position and be reviewed against it. Our part is that the network is structured so the separation, the policy and the enforcement points are where they need to be.
Neighbours, in a way other sectors do not have
A shopping centre unit or a high-street shop is surrounded by other retailers' networks, the centre's own network, and in some cases a mall-wide public service, all radiating through party walls that were never built with RF in mind. Spectrum in a busy retail location is genuinely crowded, and a design that ignores that will be surprised by it.
What we usually find
- One access point in the ceiling above the tills. Excellent at the till point, marginal in the aisles, absent in the stockroom.
- A design done before the fit. Surveyed as an empty shell, never revisited once the shelving and the stock went in.
- Customer and business traffic on one network, with no bandwidth policy, and a payment estate that gets slower as the store gets busier.
- Scanners falling back to 2.4 GHz in a location where 2.4 GHz is already saturated by neighbouring units.
- Stockroom coverage borrowed from the shop floor, through a solid wall, past a fire door that is normally closed.
- A different design in every store. Different hardware, different SSIDs, different configuration, no documentation — so nothing can be supported consistently and every site is a special case.
- Nobody monitoring anything. The first indication of a fault is a store manager ringing about the tills.
How we design retail
Survey trading stores, in trading condition
Wherever possible we survey with the stock in and the store open, because that is the environment the devices work in. Where a store is being fitted out, a predictive design from the shopfit drawings sets the positions and the cabling, followed by an on-site validation once the fixtures and stock are in — the two together, rather than either alone. See Wi-Fi surveys for how those fit together.
Design to the scanner, not the till
Signal thresholds and minimum data rates set for the weakest device in the estate, with coverage confirmed down the aisles, through the chiller run, in the stockroom and at goods-in. Roaming designed along the routes colleagues actually walk with a device in hand, so a stock count does not drop halfway down an aisle.
Separate the trading network completely
EPOS, payment, back office, colleague devices, customer access and any building services — signage, CCTV, refrigeration monitoring, energy metering — separated by SSID and VLAN with policy behind it. Customer traffic bounded with per-client limits and airtime fairness so it cannot affect trading systems no matter how busy the store is.
Design the customer experience deliberately
Portal, onboarding, session behaviour and any analytics or app integration specified as part of the design rather than switched on later, and documented so the retailer's own privacy and data-protection review has something concrete to look at.
A standard design for a multi-site estate
Where you run more than a handful of stores, the value is in consistency: the same platform, the same SSID and VLAN structure, the same configuration template, the same cabling and labelling standard, the same documentation format. Stores get grouped by format and size, each format gets a design pattern, and each individual store is surveyed against its pattern rather than designed from scratch. That is what makes an estate supportable by one team, comparable between sites, and quick to roll out — and it means a store that develops a fault can be compared against a known-good baseline instead of investigated blind.
Monitoring across the estate
Centralised monitoring so a degrading store is identified before a manager rings about the tills, with health checks and reporting that show which sites need attention. See managed Wi-Fi and support.
Rolling it out across trading stores
- Out of trading hours as standard. Overnight or before opening, so the shop floor is clear and the store trades normally the next morning.
- One store, one visit. Rolled out to a repeatable method so each site is surveyed, installed, commissioned and validated to the same standard, with the same paperwork, in a predictable window.
- Containment and cabling in house. Cat6A and fibre to each position, terminated, tested and certified, with the comms cabinet — which in a store is usually a cupboard shared with three other things — patched and labelled so the next person can work in it.
- Landlord and centre coordination. Shopping-centre permits, notice periods, induction and out-of-hours access handled as part of the job.
- Trading protected. No cutover during trading hours, and the existing network kept up until the new one is proven.
- Accredited and insured — CHAS, Constructionline Gold, SafeContractor and TrustMark, held through The Specialist Electrical Group — with RAMS issued before work starts.
- Capacity for a programme. Where an estate roll-out has fixed dates, we can draw on a broader range of engineers and installers rather than looking for a subcontractor at short notice.
- Validated per store, with the evidence per site, so the estate has a baseline rather than an assumption. See validation surveys.
Common questions
Our tills slow down when the shop is busy. Is that the Wi-Fi?
Often, and usually because customer traffic and trading traffic share a network with no policy between them. It can also be channel contention from neighbouring units, or an uplink that is the real constraint. All three are measurable, and the fix is different for each — which is why measuring first is cheaper than buying hardware first.
Can you survey without closing the store?
Yes, and we would rather survey a trading store because that is the environment the scanners work in. Surveying is a person walking the floor with a laptop; it is unobtrusive and can be timed away from the busiest hours. Installation is a separate matter and is normally done out of hours.
We have sixty stores. Do you survey every one?
Every store gets surveyed, but not designed from scratch. Stores are grouped by format and size, each format gets a design pattern, and each site is surveyed against its pattern — so you get an estate that is consistent, supportable and comparable between sites, without pretending that two shops with the same square footage are the same shop.
Should customer Wi-Fi be on the same network as our tills?
No. They should be separated by SSID and VLAN with policy behind the separation, so customer traffic is bounded and cannot affect trading systems. Your payment estate will also have its own requirements from your acquirer and your PCI position; the network is designed to meet whatever those specify.
Can you cover the stockroom and goods-in properly?
Yes, and they should never be an afterthought. Stockrooms are dense, often behind solid construction, and they are where the weakest devices in the estate do the most work. They are designed as their own coverage requirement rather than served by spill from the shop floor.
Let's find out what your Wi-Fi is actually doing.
Book a survey and you get measured data, a design you can build to, and a number you can budget against — not an opinion.